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Add some comments, add new getGlobalVariable method
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10671 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -23,6 +23,10 @@
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#include <map>
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// Stuff to implement the globals and functions lists.
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//
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Function *ilist_traits<Function>::createNode() {
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FunctionType *FTy =
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FunctionType::get(Type::VoidTy, std::vector<const Type*>(), false);
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@ -62,6 +66,9 @@ namespace llvm {
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};
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}
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//===----------------------------------------------------------------------===//
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// Primitive Module methods.
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//
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Module::Module(const std::string &MID)
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: ModuleID(MID), Endian(AnyEndianness), PtrSize(AnyPointerSize) {
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@ -87,6 +94,10 @@ void Module::dump() const {
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print(std::cerr);
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}
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//===----------------------------------------------------------------------===//
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// Methods for easy access to the functions in the module.
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//
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// getOrInsertFunction - Look up the specified function in the module symbol
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// table. If it does not exist, add a prototype for the function and return
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// it. This is nice because it allows most passes to get away with not handling
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@ -128,7 +139,6 @@ Function *Module::getOrInsertFunction(const std::string &Name,
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}
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// getFunction - Look up the specified function in the module symbol table.
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// If it does not exist, return null.
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//
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@ -201,6 +211,33 @@ Function *Module::getNamedFunction(const std::string &Name) {
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return Found; // Non-external function not found...
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}
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//===----------------------------------------------------------------------===//
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// Methods for easy access to the global variables in the module.
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//
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/// getGlobalVariable - Look up the specified global variable in the module
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/// symbol table. If it does not exist, return null. Note that this only
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/// returns a global variable if it does not have internal linkage. The type
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/// argument should be the underlying type of the global, ie, it should not
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/// have the top-level PointerType, which represents the address of the
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/// global.
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///
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GlobalVariable *Module::getGlobalVariable(const std::string &Name,
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const Type *Ty) {
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if (Value *V = getSymbolTable().lookup(PointerType::get(Ty), Name)) {
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GlobalVariable *Result = cast<GlobalVariable>(V);
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if (!Result->hasInternalLinkage())
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return Result;
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}
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return 0;
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}
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//===----------------------------------------------------------------------===//
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// Methods for easy access to the types in the module.
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//
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// addTypeName - Insert an entry in the symbol table mapping Str to Type. If
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// there is already an entry for this name, true is returned and the symbol
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@ -245,6 +282,11 @@ std::string Module::getTypeName(const Type *Ty) const {
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}
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//===----------------------------------------------------------------------===//
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// Other module related stuff.
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//
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// dropAllReferences() - This function causes all the subelementss to "let go"
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// of all references that they are maintaining. This allows one to 'delete' a
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// whole module at a time, even though there may be circular references... first
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